Presuming you made this yourself?
What was originally there?
My concern is that the water
tightness relies solely on the bulb seal. Which will deteriorate. There doesn't appear to be any channel type feature to divert water
around the opening, but that isn't your fault. If does not appear to be a feature of the locker lip itself.
Part II - Do people stand or climb on that locker? It looks great now when unmarked and unscratched. Maybe you can keep it from getting wear and tear but it will look yucky when and if it gets scratched up.